octobre 20 2006mpi munich vfcal report w. lohmann, desy laser alignment system infrastructure for...

Octobre 20 2006 MPI Munich

VFCAL Report

W. Lohmann, DESY

Laser alignment system

Infrastructure for sensor diagnostics

Sensor test facilities

FE design

Labs involved: Cracow UST, Cracow INP, Prague (AS), Tel Aviv Univ. DESY (Z.)


Current design (Example LDC, 14 mrad):

LumiCal(Luminometer)

BeamCal

TPC

ECA

L

HCAL

LumiCal: -control of position on ~10 m level -control of the inner acceptance radius on ~m level BeamCal: -radiation hard sensors (~10 MGy/year)

Both: -compact (smallest possible Moliere radius) -readout after each BX

Challenges


Laser alignment system

Two laser beams (one perpendicular, second with 45˚ angle to the sensor plane) allows to measure XYZ translation in one sensor

Wojciech Wierba et al., INP Cracow


Results and Status

New lasers with aspherical lenses – better spot.New lasers with aspherical lenses – better spot.Setup with two lasers – avoid beam splittingSetup with two lasers – avoid beam splittingCompact prototype – in progress (new person involved)Compact prototype – in progress (new person involved)Reference measurement of XYZ translations – Renishaw Reference measurement of XYZ translations – Renishaw industrial system (0.1 μm resolution)industrial system (0.1 μm resolution)Stability tests Stability tests

+-1 m +-

5 m

xy z


Infrastructure for Sensor Tests

H. Abramovicz, W. Lange et al., TAU, DESY

How can we characterize a sensor?

• I/V measurement with both polarities• C/V measurement (semiconductor (Vdep ?) or insulator?)• spectrum for MIPs (charge collection efficiency)• charge collection, leakage current etc. vs. irradiation dose• …• Always check calibration, data integrity, repeatability• Bookkeeping of data: from files to a data base

Measurement of mip spectra


Infrastructure for Sensor Tests

Rooms (Cracow, DESY):two rooms with filtered air (10k), stabilized temperature• room 1: bonding and assembly• room 2: all measurements without radioactive sourceInstruments:• manual prober in a shielded box (light, electrical screening)• manual prober for probe cards (chip testing)• microscopes with a large object distance• manual bonding machine with x-y computer control• glueing tools, oven etc.• computer controlled instruments (I, C, V, V and I sources)

Prob Station in TA


Test Beam Equipment

exit windowof beam line

collimator (IColl)

sensor box (IDia, TDia, HV)

Faraday cup (IFC, TFC)


FE design and studies H. Henschel, M. Idzik et al.,

Cracow Univ., DESY

Readout board for PHY3 chip with - control input/output- level shifters

- biasing switches & networks

- power connector - 18 FE inputs

- Amplifier


Sequential Readout

• definite charge of 0.33pC injected into one channel after the other

• readout with (slow) clock, hence considerable decay of captured charge is observed

Testmeasurements with Phy3


•signal from 4 fC (mip) to 6 pC• high occupancy – no multiplexing• DC coupled sensors, Cdet 20 -120 pf + fanout (~1pF/cm)• 300 (150) ns between bunches• limited power dissipation (~10 mW/ch)

•Charge sensitive• test and physics mode variable gain• test mode: S/N ~ 10 physics mode: > 11 bit• Tpeak: 50-70 ns

Future Design


•First prototype submission in 2-3 months•Testbeam application planned• More studies on general readout architecture necessary• Compatibility with mechanics/cooling

Plans and Summary

First steps are done:

•Test beam equipment partially available and running, completion is ongoing

•Laser alignment ‘proof of principle experiment’ under construction

• Test facilities for sensors in Zeuthen and Tel Aviv; Zeuthen will be upgraded, Tel Aviv started to collect equipment

•FE electronics development started

octobre 20 2006mpi munich vfcal report w. lohmann, desy laser alignment system infrastructure for...

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